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The structure and morphology of polymers are significantly altered uponexposure to high energy gamma irradiation. The present investigation reportsthe influence of such irradiation of doses in the range of 1 - 30 kGy on theparticle size of Poly (Ethylene Oxide) [PEO] powder along with its correlationwith molecular weight distribution. Pore-size distribution and overall porosityof the synthesized films prepared with irradiated and unirradiated PEO powderis also reported. The particle size of both unirradiated and irradiated PEOpowders is found be in the range of 0.01 - 1000 micrometer. It is known that,variation in irradiation dose either generates particles of lower dimensionthrough bond breakage i.e scission or higher dimension through cross-linkage.PEO films exhibit strong dependence of irradiation effect on pore sizedistribution and porosity. PEO films synthesized using both unirradiated andirradiated powders exhibit pore dimension in the range of 20 - 500 nm. Theoverall porosity of PEO films studied through BET adsorption techniqueinitially increases with dose upto 3 kGy followed by linear decrease upto 30kGy. Films cast with unirradiated PEO powder show multimodal pore sizedistribution, but perturbation with irradiation changes the modality to uni-orbimodal nature. The mentioned outcome of irradiation viz. particle and poresize variation is also correlated with PEO microstructures.The articledemonstrates that, selective irradiation is capable of tailoring the pore-sizewithin a definite regime thereby reducing the multimodal trait. The reportedstudy may be relevant towards applications such as catalysis, sensing andfiltration, where pore size distribution plays a crucial role.

Impact of Tailored Gamma Irradiation on Pore Size and Particle Size of  Poly[Ethylene Oxide]Films: Correlation with Molecular Weight Distribution  andMicrostructural Study